<script setup>
import {ref,watch} from 'vue'
import {useMouseInElement} from "@vueuse/core";
// 图片列表
// const imageList = [
//   "https://yanxuan-item.nosdn.127.net/d917c92e663c5ed0bb577c7ded73e4ec.png",
//   "https://yanxuan-item.nosdn.127.net/e801b9572f0b0c02a52952b01adab967.jpg",
//   "https://yanxuan-item.nosdn.127.net/b52c447ad472d51adbdde1a83f550ac2.jpg",
//   "https://yanxuan-item.nosdn.127.net/f93243224dc37674dfca5874fe089c60.jpg",
//   "https://yanxuan-item.nosdn.127.net/f881cfe7de9a576aaeea6ee0d1d24823.jpg"
// ]
// 从父亲获取数据
const props=defineProps({
  imageList:{
    type:Array,
    default:()=>[]
  }
})


// 小图切换大图显示
const activeIndex=ref(0)

const enterHandler=(index)=>{
  // console.log("此时index:",index)
  activeIndex.value=index
}

//获取鼠标在图层上的坐标
const target=ref(null)
const {elementX,elementY,isOutside}=useMouseInElement(target)
// console.log(elementX,elementY,isOutside)
//控制滑块移动
const left=ref(0)
const top=ref(0)
const positionX=ref(0)
const positionY=ref(0)
//大图显示

watch([elementX,elementY,isOutside],()=>{
  console.log("xy变化了")
  //如果不在盒子里面，取消监听
  if(isOutside.value){
    return
  }
  //横向
  if(elementX.value>100 && elementX.value<300){
    left.value=elementX.value-100
  }
  //纵向
  if(elementY.value>100 && elementY.value<300){
    top.value=elementY.value-100
  }
  //边界处理
  if(elementX.value>300){
    left.value=200
  }
  if(elementX.value<100){
    left.value=0
  }
  if(elementY.value>300){
    top.value=200
  }
  if(elementY.value<100){
    top.value=0
  }
  // console.log(left.value,top.value)
  //控制大图显示
  positionX.value=-left.value*2
  positionY.value=-top.value*2
})
</script>


<template>
<!--  {{elementX}}  {{elementY}}  {{isOutside}}-->
  <div class="goods-image">
    <!-- 左侧大图-->
    <div class="middle" ref="target">
      <img :src="imageList[activeIndex]" alt="" />
      <!-- 蒙层小滑块 -->
      <div  :class="{layer:!isOutside}" :style="{ left: `${left}px`, top: `${top}px` }"></div>
    </div>
    <!-- 小图列表 -->
    <ul class="small">
      <li v-for="(img, i) in imageList" :key="i" @mouseenter="enterHandler(i)" :class="{active: i===activeIndex}">
        <img :src="img" alt="" />
      </li>
    </ul>
    <!-- 放大镜大图 -->
    <div class="large" :style="[
      {
        backgroundImage: `url(${imageList[activeIndex]})`,
        backgroundPositionX: `${positionX}px`,
        backgroundPositionY: `${positionY}px`,
      },
    ]" v-show="!isOutside"></div>
  </div>
</template>

<style scoped lang="scss">
.goods-image {
  width: 480px;
  height: 400px;
  position: relative;
  display: flex;

  .middle {
    width: 400px;
    height: 400px;
    background: #f5f5f5;
  }

  .large {
    position: absolute;
    top: 0;
    left: 412px;
    width: 400px;
    height: 400px;
    z-index: 500;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    background-repeat: no-repeat;
    // 背景图:盒子的大小 = 2:1  将来控制背景图的移动来实现放大的效果查看 background-position
    background-size: 800px 800px;
    background-color: #f8f8f8;
  }

  .layer {
    width: 200px;
    height: 200px;
    background: rgba(0, 0, 0, 0.2);
    // 绝对定位 然后跟随咱们鼠标控制left和top属性就可以让滑块移动起来
    left: 0;
    top: 0;
    position: absolute;
  }

  .small {
    width: 80px;

    li {
      width: 68px;
      height: 68px;
      margin-left: 12px;
      margin-bottom: 15px;
      cursor: pointer;

      &:hover,
      &.active {
        border: 2px solid $xtxColor;
      }
    }
  }
}
</style>